Lingxian Kong 523d66e8fd Fix CI job
* Fix pep8: ambiguous variable name
* Install Python 3.7 for trove guest image. oslo.concurrency requires
  python 3.6 or newer. See
  https://bugs.launchpad.net/tripleo/+bug/1861803
* Mark tempest job non-voting temporarily because of some tempest bugs.

Change-Id: I6d316779cc7220a855ce187437056b667bbe1f75
2020-05-25 17:37:38 +12:00
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